215407864631 has 2 divisors, whose sum is σ = 215407864632. Its totient is φ = 215407864630.

The previous prime is 215407864621. The next prime is 215407864681. The reversal of 215407864631 is 136468704512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215407864631 - 2¹⁰ = 215407863607 is a prime.

It is a super-2 number, since 2×215407864631² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215407864601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107703932315 + 107703932316.

It is an arithmetic number, because the mean of its divisors is an integer number (107703932316).

Almost surely, 2^215407864631 is an apocalyptic number.

215407864631 is a deficient number, since it is larger than the sum of its proper divisors (1).

215407864631 is an equidigital number, since it uses as much as digits as its factorization.

215407864631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 967680, while the sum is 47.

The spelling of 215407864631 in words is "two hundred fifteen billion, four hundred seven million, eight hundred sixty-four thousand, six hundred thirty-one".